wb.java

it is whiteboard sourse code

package org.merlin.step.nov;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class WB extends Frame implements ActionListener {
  public WB () {
    super ("Whiteboard");
    enableEvents (AWTEvent.WINDOW_EVENT_MASK);
  }

  protected void processWindowEvent (WindowEvent e) {
    super.processWindowEvent (e);
    if (e.getID () == WindowEvent.WINDOW_CLOSING)
      setVisible (false);
  }

  protected void processEvent (AWTEvent e) {
    if ((e instanceof ActionEvent) && (e.getSource () instanceof Applet)) {
      init ((Applet) e.getSource ());
    } else {
      super.processEvent (e);
    }
  }

  Applet parent;
  ObservableList contents;
  Hashtable ctrlImages, ctrlClasses;
  LWContainer infoHolder;
  WBContainer display;

  void init (Applet a) {
    parent = a;
    contents = new ObservableList ();
    display = new WBContainer (contents, new Dimension (256, 256));
    display.setLayout (new BorderLayout ());
    add ("Center", display);
    LWContainer ctrlHolder = new LWContainer (), ctrls = new LWContainer ();
    add ("West", ctrlHolder);
    ctrlHolder.setLayout (new FlowLayout (FlowLayout.LEFT, 0, 0));
    ctrlHolder.add (ctrls);
    ctrls.setLayout (new GridLayout (0, 1, 0, 2));
    ctrlImages = new Hashtable ();
    ctrlClasses = new Hashtable ();
    try {
      URL u = new URL (parent.getCodeBase (), "config.txt");
      BufferedReader r = new BufferedReader (new InputStreamReader (u.openStream (), "latin1"));
      String line;
      while ((line = r.readLine ()) != null) {
        StringTokenizer t = new StringTokenizer (line, ",");
        String name = t.nextToken (), imageName = t.nextToken (), className = t.nextToken ();
        Image theImage = parent.getImage (parent.getCodeBase (), imageName);
        LWImageButton button = new LWImageButton (name, theImage, new Dimension (64, 64));
        ctrls.add (button);
        ctrlImages.put (name, theImage);
        try {
          ctrlClasses.put (name, Class.forName (className));
        } catch (ClassNotFoundException ex) {
        button.setEnabled (false);
        }
        button.addActionListener (this);
      }
      r.close ();
    } catch (IOException ex) {
      ex.printStackTrace ();
    }
    infoHolder = new LWContainer ();
    infoHolder.setLayout (new BorderLayout ());
    LWImageButton logo = new LWImageButton ("", parent.getImage (parent.getCodeBase (), "logo.jpeg"), new Dimension (64, 64));
    logo.setEnabled (false);
    infoHolder.add ("West", logo);
    add ("South", infoHolder);
    pack ();
  }

  Tool currentTool;

  public void actionPerformed (ActionEvent e) {
    Image theImage = (Image) ctrlImages.get (e.getActionCommand ());
    Class theClass = (Class) ctrlClasses.get (e.getActionCommand ());
    try {
      if (currentTool != null) {
        currentTool.dispose ();
        currentTool = null;
      }
      currentTool = (Tool) theClass.newInstance ();
      currentTool.setDisplayList (contents);
      LWImageButton button = new LWImageButton (e.getActionCommand (), theImage, new Dimension (64, 64));
      button.setEnabled (false);
      infoHolder.removeAll ();
      infoHolder.add ("West", button);
      infoHolder.add ("Center", currentTool.getControls ());
      infoHolder.validate ();
      display.removeAll ();
      display.add ("Center", currentTool.getDisplay ());
      display.validate ();
    } catch (InstantiationException ex) {
      ex.printStackTrace ();
    } catch (IllegalAccessException ex) {
      ex.printStackTrace ();
    }
  }
}